1, Electrostatic damage mechanism and failure mode
The physical process of electrostatic damage
When the environmental humidity is below 60%, the static charges generated by friction between the human body and insulation materials can form a potential difference of up to tens of thousands of volts on the surface of LED chips. Taking human body mode (HBM) testing as an example, when a 100pF capacitor is discharged under a 330 Ω series resistor, the instantaneous current peak can reach 1.33A, with a duration of only 100ns. This high-energy density pulse generates local high temperatures above 1400 ℃ in the PN junction region of the chip, resulting in:
Metal migration: Aluminum electrode melts to form metal whiskers, causing short circuits
Dielectric breakdown: Needle like defects appear in the passivation layer of silicon nitride
Lattice damage: dislocation defects occur in GaN epitaxial layer
2, Construction of a full chain electrostatic protection system
Production and manufacturing process
Workshop environment control:
Temperature and humidity: 22 ± 3 ℃/50 ± 10% RH (installed with industrial humidifier and dehumidifier)
Air ion concentration:>2500 ions/cm ³ (equipped with ion fan array)
Ground resistance: 10 ⁶ -10 ⁹ Ω (laid with anti-static PVC floor and copper foil mesh)
Equipment grounding system:
Adopting a three-phase five wire power supply system, the anti-static ground wire and power ground wire are independently arranged
Worktable resistance: 10 ⁶ -10 ⁹ Ω (with anti-static table mat and wrist strap grounding point)
Tip temperature: 320 ± 10 ℃ (using anti-static constant temperature soldering iron)
Personnel protection standards:
Wear anti-static jumpsuit (surface resistance<10 ¹¹Ω)
Wear a rope anti-static wristband (with a current limiting resistor of 1M Ω± 20%)
Twice daily static electricity wristband testing (tester accuracy ± 5%)
Logistics and warehousing process
Packaging material selection:
Inner packaging: Black anti-static shielding bag (surface resistance 10 ⁸ -10 ¹¹Ω)
Outer packaging: Conductive corrugated cardboard box (volume resistivity<10 ⁵Ω· cm)
Buffer material: anti-static pearl cotton (friction voltage<100V)
Storage conditions:
Warehouse temperature: 15-30 ℃
Relative humidity: 40-70%
Shelf spacing: ≥ 50cm (to avoid induced static electricity)
Installation and usage process
On site protective measures:
Construction personnel wear anti-static gloves (surface resistance 10 ⁶ -10 ⁹ Ω)
Use anti-static suction pen to operate the light strip
Install temporary ion fans in the installation area (wind speed ≥ 2m/s)
Maintenance precautions:
Use anti-static dust-free cloth during cleaning (friction voltage<50V)
Prohibition of using chemical fiber cleaning tools
During maintenance, discharge the lamp body first (using a 1M Ω resistor to contact the pins)
Online detection technology
Human body electrostatic detection: using a non-contact electrostatic voltmeter (range 0-30kV, accuracy ± 3%)
Equipment grounding detection: Use a grounding resistance tester (range 0-1000 Ω, accuracy ± 1%)
Lamp bead anti-static test:
Human Body Mode (HBM): 250V/500V/1000V Level 3 Test
Machine mode (MM): 200V standard test
Charging Device Mode (CDM): 500V Standard Test
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